yeast artificial chromosome

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Fragment of DNA from the human genome inserted into a yeast cell. The yeast replicates the fragment along with its own DNA. In this way the fragments are copied to be preserved in a gene library. YACs are characteristically between 250,000 and 1 million base pairs in length. A cosmid works in the same way.

Nowadays the colours are said to stand for Moldavia, Transylvania, and Wallachia. Effective date: 27 December 1989. >>